While uterine fibroids seem to be in no way affected by HCG in the doses we use, we have found that very large, externally palpable uterine myomas are apt to give trouble. We are convinced that this is entirely due to the rather sudden disappearance of fat from the pelvic bed upon which they rest and that it is the weight of the tumor pressing on the underlying tissues which accounts for the discomfort or pain which may arise during treatment. While we disregard even fair-sized or multiple myomas, we insist that very large ones be operated before treatment. We have had patients present themselves for reducing fat from their abdomen who showed no signs of obesity, but had a large abdominal tumor.
Small stones in the gall bladder may in patients who have recently had typical colics cause more frequent colics under treatment with HCG. This may be due to the almost complete absence of fat from the diet, which prevents the normal emptying of the gall bladder. Before undertaking treatment we explain to such patients that there is a risk of more frequent and possibly severe symptoms and that it may become necessary to operate. If they are prepared to take this risk and provided they agree to undergo an operation if we consider this imperative, we proceed with treatment, as after weight reduction with HCG the operative risk is considerably reduced in an obese patient. In such cases we always give a drug which stimulates the flow of bile, and in the majority of cases nothing untoward happens. On the other hand, we have looked for and not found any evidence to suggest that the HCG treatment leads to the formation of gallstones as pregnancy sometimes does.
Source: Pounds and Inches by Dr. Simeons